Word problems are tricky! Do I add or subtract? Am I missing a part or the total? Use this warm up to spend 5 minutes once a week practicing solving word problems. All the problems are addition or subtraction within 20. They increase in difficulty of determining the operation as you progress through the slides. All students need is a dry erase marker and personal whiteboard to participate. Or use a math journal so that students can reflect back on their work throughout the year. There are enough